Letter | Published:

Drag Coefficients for Spheres in High Reynolds Number Flow of Dilute Solutions of High Polymers

Nature volume 212, pages 277278 (15 October 1966) | Download Citation



DILUTE polymer solutions show substantial reduction of drag in turbulent pipe flow1 and a 28 per cent reduction has been reported for sphere drag coefficients in a 0.5 per cent solution of Guar gum for a 1 in. diameter steel ball2. These drag coefficients were measured by timing balls falling down a 3 in. tube. Greater reductions of sphere friction factors were noted in my recent experiments. Balls were dropped by hand in a glass fronted tank, 1 ft. square and 6 ft. deep. The terminal velocity was found using a photographic technique3 in which the position of the ball every 0.04 sec was recorded on a 35 mm negative.

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  1. 1.

    , Fourth Intern. Cong. Rheol., 3, 455 (1964).

  2. 2.

    , Nature, 205, 614 (1965).

  3. 3.

    , et al., Chem. Eng. Sci., 20, 997 (1965).

  4. 4.

    , Ergeb. Aerodyn. Ver. Göttingen, 2, 22 (1923).

  5. 5.

    , and , Applied Hydro and Aeromechanics, 98 (Dover, 1957).

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  1. Department of Chemical Engineering, University College, London.

    • D. A. WHITE


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